1131213100021 has 8 divisors (see below), whose sum is σ = 1131763126424. Its totient is φ = 1130663162880.

The previous prime is 1131213100019. The next prime is 1131213100093. The reversal of 1131213100021 is 1200013121311.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 8066734225 + 1123146365796 = 89815^2 + 1059786^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1131213100021 - 2¹ = 1131213100019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1131213099968 and 1131213100004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131213100321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52768321 + ... + 52789753.

It is an arithmetic number, because the mean of its divisors is an integer number (141470390803).

Almost surely, 2^{1131213100021} is an apocalyptic number.

It is an amenable number.

1131213100021 is a deficient number, since it is larger than the sum of its proper divisors (550026403).

1131213100021 is a wasteful number, since it uses less digits than its factorization.

1131213100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44631.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 1131213100021 its reverse (1200013121311), we get a palindrome (2331226221332).

The spelling of 1131213100021 in words is "one trillion, one hundred thirty-one billion, two hundred thirteen million, one hundred thousand, twenty-one".